WILTON -- The Cosumnes River is expected to rise above its levees overnight, potentially flooding many homes in nearby Wilton in Southern Sacramento County. The Sacramento Sheriff's Department has put a voluntary evacuation order in place for the area.

Those who live in Wilton are keeping a close eye on the Cosumnes River, hoping it doesn't flood, but the National Weather Service says it will.

"Essentially one foot over the flood stage. That's supposed to last from 11 p.m. to 7 a.m.," said Matt Robinson, a spokesperson with the Sacramento County Department of Water Resources.

With Dillard Road already beginning to flood, and more roads expected to flood by Tuesday night, Sacramento County has issued a voluntary evacuation for Wilton.

"And we're hoping that folks will do it before night time because it will be a lot more difficult to get people out when it's darker," Robinson told FOX40.

But many who live in the area said they're hunkering down.

"(I'm going to) stay home, I've been through this in '97," said Delos Smothermon, who was buying what he and his wife, Marilyn Smothermon, need from the store Tuesday.

"We've got milk and orange juice so plenty of food," said Marilyn Smothermon.

Others are hoping for the best, but preparing for the worst, high water, with sandbags.

"It's a little scary, you know you just kinda have to wait and see," said Roberta Azevedo, who does not plan to evacuate.

But if the water does come, Roberta Azevedo and her husband, Al Azevedo, do have a Plan B.

"We have a fifth wheel trailer that's parked up on high grounds, and that's where we'll go," said Al Azevedo.

Due to roadway flooding and road closures the safest route for evacuations is either Alta Mesa Rd or Clay Station Rd southbound. A red cross evacuation center will be opened at 7 p.m. at the Elk Grove Pavilion inside Elk Grove Park9950 Elk Grove Florin Road. The access gate on East Stockton Boulevard will be open all night.